Add package javadocs.
expand section about using groovy-eclipse-compiler, add direct links to its jira for reporting problems.
use html sections in .vm filtered files
Enable mailing lists.
Add properties to link to external javadocs.  Enable links in javadoc configuration.
Update to Groovy 2.1.5, use property to keep site docs in sync.
Use simpler tables in variables.  Use reference links.  Link to jdk bits too.
use @link and ignore javadoc warnings in api sources for better javadoc ref
playing with some options to run integration-tests
still playing with its, not sure how I want to set this up to simplify testing yet :-\
playing with suites
more mucking about for its, apis here are not very nice :-(
some structure and order
Add more combonations, use -V flag to get env details into log